A Novel Double-Group Cross-Linking Hydrogel With High Thixotropy for Water Control in the Horizontal Wells

2020 ◽  
Author(s):  
Lifeng Chen ◽  
Yadong Chen ◽  
Xiaoming Zhu ◽  
Gang Li ◽  
Meilong Fu
Keyword(s):  
Horizontal Wells ◽  
Cross Linking ◽  
Water Control ◽  
Double Group

A Novel Double-Group Crosslinked Hydrogel with High Thixotropy for Water Control in Horizontal Wells

SPE Journal ◽  
2020 ◽  
pp. 1-15
Author(s):  
Gang Li ◽  
Lifeng Chen ◽  
Meilong Fu ◽  
Lei Wang ◽  
Yadong Chen ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Gelation Time ◽  
Horizontal Wells ◽  
Uniform Grid ◽  
Drilling Fluids ◽  
Water Production ◽  
Water Control ◽  
Recovery Coefficient ◽  
Metastable Structure ◽  
Control Water

Summary Horizontal wells that are completed with slotted liners often suffer from a severe water-production problem, which is detrimental to oil recovery. It is because the annulus between the slotted liners and wellbore cannot be fully filled with common hydrogels with poor thixotropy, which determines the ultimate hydrogel filling shape in the annulus. This paper presents a novel hydrogel with high thixotropy to effectively control water production in horizontal wells. This study is aimed at evaluating the thixotropic performance, gelation time, plugging performance, and degradation performance. The thixotropic performance of the new hydrogel was also investigated by measuring its rheological properties and examining its microstructures. It was found that the new hydrogel thickened rapidly after shearing. Its thixotropic recovery coefficient was 1.747, which was much higher than those of traditional hydrogels. The gelation time can be controlled in the range of 2 to 8 hours by properly adjusting the concentrations of the framework material, crosslinker, and initiator. The hydrogel could be customized for mature oil reservoirs, at which it was stable for more than 90 days. A series of laboratory physical modeling tests showed that the breakthrough pressure gradient and the plugging ratio of the hydrogel in sandpacks were higher than 9.5 MPa/m and 99%, respectively. At the same time, it was found that the hydrogel has good degradation properties; the viscosity of the hydrogel breaking solution was 4.22 mPa·s. Freeze-etching scanning-electron-microscopy examinations indicated that the hydrogel had a uniform grid structure, which can be broken easily by shear and restored quickly. This led to the remarkable thixotropic performance. The formation of a metastable structure caused by the electrostatic interaction and coordination effect was considered to be the primary reason for the high thixotropy. The successful development of the new thixotropic hydrogel not only helps to control water production from the horizontal wells, but also furthers the thixotropic theory of hydrogel. This study also provides technical guidelines for further increasing the thixotropies of drilling fluids, fracturing fluids, and other enhanced-oil-recovery polymers that are commonly used in the petroleum industry.

Innovative Water Control Technique for Horizontal Wells in Isotropic Reservoirs - Successful Case History From Belayim Field

2015 ◽  
Author(s):  
Ahmed. F. El Gogary ◽  
Hossam. H. El-Masry ◽  
Mostafa. M. Kortam ◽  
Hany. R. El-Rayek
Keyword(s):  
Case History ◽  
Horizontal Wells ◽  
Control Technique ◽  
Water Control ◽  
Successful Case

scholarly journals Research of water control technology for horizontal wells in water-driven reservoirs

2018 ◽  
Vol 2 (2) ◽  
pp. 210-217
Author(s):  
Baobing Shang ◽  
Xiaodong Han ◽  
Shuai Li ◽  
Kouqi Liu
Keyword(s):  
Horizontal Wells ◽  
Control Technology ◽  
Water Control

Water Control Success in Onshore and Offshore Horizontal Wells Completed With Slotted Liners by Annular Isolation - Case Studies From China

2014 ◽  
Author(s):  
Falin Wei ◽  
Yuzhang Liu ◽  
Chunming Xiong ◽  
He Liu ◽  
Yikun Li ◽  
...  
Keyword(s):  
Case Studies ◽  
Horizontal Wells ◽  
Water Control

A Dual Multilateral Completion as an Alternative to Un-Wanted Water Control in Horizontal Wells

2015 ◽  
Author(s):  
Musaab Ibrahim Magzoub ◽  
M. Enamul Hossain
Keyword(s):  
Horizontal Wells ◽  
Water Control

scholarly journals Evaluation of influencing factors on the adaptability of ICD completion technology

2021 ◽  
Vol 261 ◽  
pp. 02071
Author(s):  
Guohui Zhang ◽  
Liangchuan Li ◽  
Rong Chen ◽  
Peng Wang ◽  
Guowen Zhang ◽  
...  
Keyword(s):  
Comprehensive Evaluation ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Horizontal Wells ◽  
Water Production ◽  
Water Control ◽  
Orthogonal Experiment Design ◽  
Factors Affecting ◽  
Well Completion ◽  
Main Index

After years of research and practice, ICD well completion technology has become a relatively mature completion technology, and has been successfully applied in hundreds of horizontal Wells abroad. However, due to many factors affecting ICD effect, mature evaluation methods have not been completely established. At present, the main index of ICD water control development effect is to balance inflow profile and inhibit water production, and the evaluation factors involve reservoir, process and equipment structure. This paper summarizes the factors influencing the effects of ICD, using orthogonal experiment design method to carry on the comprehensive evaluation, and puts forward the corresponding Suggestions

Mechanical Stability and Proteolytic Activity of Resin–dentin Bonds Using the Cross-linked Dry Bonding Technique

2021 ◽  
Author(s):  
M Citta ◽  
G Anovazzi ◽  
FG Basso ◽  
DLS Scheffel ◽  
J Zhou ◽  
...  
Keyword(s):  
Bond Strength ◽  
Proteolytic Activity ◽  
Mechanical Stability ◽  
Grape Seed ◽  
Cross Linking ◽  
Water Control ◽  
Group 4 ◽  
Etch And Rinse ◽  
The Cross ◽  
Group 2

SUMMARY Objective: To evaluate the mechanical stability and the proteolytic activity of bonds created by a two-step, etch-and-rinse adhesive applied to cross-linked and air-dried etched dentin. Methods: Flat dentin surfaces were produced in 64 extracted sound human molars. The dentin was etched with 35% phosphoric acid for 15 seconds, and then the teeth were divided into groups according to the cross-linking solution applied on the etched dentin. Group 1: 5% grape seed extract (GSE), Group 2: 5% glutaraldehyde, Group 3: Gluma Desensitizer, or Group 4: deionized water (control). Solutions were applied for 60 seconds, followed by rinse and blot drying. Then, the teeth were separated into two subgroups where the etched dentin was kept moist or air-dried. The adhesive was applied followed by a composite resin buildup. After 24 hours, the teeth were cut into beams (0.81 mm2) that were tested for microtensile strength immediately or after 12 months of aging in a 37°C saliva-like buffer. Additional teeth (n=32) were bonded as described and cut into 0.5-mm-thick slabs. The slabs were prepared for nanoleakage (scanning electron microscopy) and in situ zymography (EnzChek Protease Assay Kit). Bond strength data were submitted to ANOVA and Tukey tests (α=0.05). Results: Significant reduction in immediate bond strength (ca 65%) and increase in proteolytic activity was seen when the etched dentin was air dried without previous cross-linking biomodification. Conversely, bond strengths did not differ from those produced on wet dentin when collagen was cross-linked before air drying, irrespective of the solution applied. For both moist and air-dried etched dentin, collagen cross-linking resulted in mechanically stable bonds and reduced proteolytic activity after 12 months of storage. Conclusion: Bonds produced by the application of a two-step, etch-and-rinse adhesive to cross-linked, air-dried, etched dentin were mechanically stable and revealed reduced proteolytic activity after 1 year of aging.

scholarly journals Application of binary compound water control technology in the development of horizontal wells in offshore oil fields

2019 ◽  
Vol 384 ◽  
pp. 012111
Author(s):  
Yigang Liu ◽  
Yunbao Zhang ◽  
Baoqing Xue ◽  
Yikuan Lu ◽  
Jia Wang ◽  
...  
Keyword(s):  
Horizontal Wells ◽  
Binary Compound ◽  
Oil Fields ◽  
Control Technology ◽  
Water Control ◽  
Offshore Oil
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